Disreputable debonair artist at The Lighthouse, Dublin (6)
I believe the answer is:
rakish
'disreputable debonair' is the definition.
I can't tell whether this definition defines the answer.
'artist at the lighthouse dublin' is the wordplay.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'at' says to put letters next to each other.
'the lighthouse dublin' becomes 'kish' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ra'+'kish'='RAKISH'
Can you help me to learn more?
(Other definitions for rakish that I've seen before include "Jaunty; dissolute" , "Dapper" , "Disreputably dashing" , "Dashing, devil-may-care" , "Given to philandering" .)